The 2006 Rolex Cosmograph Daytona Ref. 116520 (Black Dial) is a 40mm stainless steel chronograph powered by Rolex's first in-house automatic chronograph movement, the Caliber 4130. Produced between 2000 and 2016, the reference 116520 is also the final stainless steel Daytona fitted with an engraved steel tachymeter bezel before Rolex transitioned to ceramic bezels.

• Case & Bezel. The 40mm case and fixed engraved tachymeter bezel are crafted from corrosion-resistant 904L stainless steel (Oystersteel), measuring roughly 12.3mm to 12.4mm thick with a lug-to-lug length of around 46.2mm to 47mm. 

• Movement. It houses the COSC-certified automatic Rolex Caliber 4130, featuring a column wheel, vertical clutch, 44 jewels, a 28,800 vph beat rate, and a 72-hour power reserve.

• Dial & Hands. The glossy black lacquer dial features white gold applied baton indices, wider post-2004 "fat" hands filled with Super-LumiNova, red "DAYTONA" text, and three silver-ringed subdials (running seconds at 6 o'clock, 30-minute counter at 3 o'clock, and 12-hour counter at 9 o'clock). 

• Bracelet & Water Resistance. It comes on a solid-link Oyster bracelet with polished center links, an Oysterlock clasp with a 5mm Easylink extension, screw-down chronograph pushers, a Triplock winding crown, and 100 meters (330 feet) of water resistance.